$ sudo apt-get install lshw
product: Raspberry Pi 4 Model B Rev 1.4
; Get Arm64 download URL from https://dotnet.microsoft.com/download/dotnet/5.0
$ curl [URL] --output [FILENAME]
$ sudo tar zxf [FILENAME] -C $HOME/dotnet/
$ sudo ln -s $HOME/dotnet/dotnet /usr/local/bin
; or whatever version you downloaded
; Now we need to add it to PATH. Add the exports
export DOTNET_ROOT=$HOME/dotnet
export PATH=$PATH:$HOME/dotnet
export PATH=$PATH:$HOME/.dotnet/tools
; then Ctrl+X to save and exit. finally, load the new exports